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. Y 2 Sheets-Sheen'. 1 P. FERGUSON & W. Y. ILEMINGf,` 3

Patented Deo. 4, 1894.

STEAM BOILER.

(No Mode-1.)

fil/f, mn/44,14

. UNITED STATES 'PATENT OFFICE.

PETER FERGUSON AND WILLIAM Y. FLEMING, OF` PAISLEY, SCOTLAND.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 530,331, dated December 4,1894. Application tiled August 24, 1894. Serial No. 521,207. (No model.) Patented in England December 31,` 1892, No. 24,141.

To a/ZZ whom t may concern:

Be it known that we, PETER FERGUSON and WILLIAM YOUNG FLEMING, engineers and shipbuilders, of Phoenix Works, Paisley, 'Renfrewshire, Scotland, have jointly invented new and useful Improvements in Steam-Boilers, (which have not been patented in any country except Great Britain, by Letters Patent, dated December 31,1892, No.24.,141;) and we do hereby declare that the following is a full, clear, and exact description of the same, which will enable others skilled in the art' or manufacture to which it relates to make and use thesame.

This invention relates to steam boilers of the type in which steam and water drums are connected by a large number of water tubes situated over a furnace or in a combustion chamber and it has mainly for its object by improved arrangement and construction of the parts to provide for withdrawal and re-` placing of any of the tubes which may leak or give way, without taking down or removing the casing in which the heating surfaces responding to Fig. 2 but showing the boiler as fired from the ends. Figs. 5 and `6, Sheet 2, represent in cross and longitudinal sections respectively a single tired boiler, and Figs. 7 and 8 like views of a double endedboiler.

The boiler is composed of a main drum or cylinder a, partly filled with water, the upper portion being steam space, and two or more lower drums or cylinders b, b, entirely filled with water. The lower drums b, b, are

connected to the main drum@ by a large g or replacing them in case of defect.

number t of small water tubes d, d, ol, any one of which may be withdrawn into the inside of the main drum a should it prove defcctive and a new tube inserted through said drum.

Where height is not of importance the small tubes d, d, d, may be longer and more nearly straight than as shown in the drawings by increasing the'distance between the drums, provided always that none of them are too long to be drawn into the main drum. Access can be had to all the drums by manholes e, e, e, for expanding tubes in case of leakage The downflow of the colder water from the main drum a takes place through tubesjf, fitted outside the furnace and smoke casing j, said tubes j", f, being connected to the lower drums b. The circuit is thus completed. The tubes f, should be suiiicient to give a supply of water equal to that flowing through the small tubes d, d, d, and are so placed as to distribute the waterto the drums b, so as to insure uniform distribution of the water through the tubes d. I

The hot gases from the furnace h, pass upward between the small water tubes ci, d, d, which are so arranged as to intercept their passage asV much as possible and thence to the funnel or smoke stack t'.

Figs. 1 to 4 of the drawings show two independent boilers connected by a single smoke stack; Figs. 5 and 6, a single lboiler and smoke stack, and Figs. 7 and 8 a single boiler having four drums b, connected to the main drum or cylinder ot, within the combustion chamber.

Having now described the invention, what we claim, and desire to secure by Letters Patent, is-

In a steam boiler, the combination of two or more water drums b' in proximity to the furnace, an independent steam and water drum ctin the uptake, said drums a and b being independent ofm each other, a number of small Water tubes d connecting the drums our hands and seals the 6th day of August,

b and a and each adapted to be Withdrawn 1894. into the main drum ct, and independent cir- PETER FERGUSON. fL. 8.]

culatlng tubes f tted outslde of the furnace 5 and smoke casing and connecting the lower W' Y' FLEMING [L S] drums with the upper drum and havingr a ca- Witnesses: pacity sufficient to give a supply of Water WALLACE FAIRWEATHER, C. E., equal to that flowing through the small tubes Chartered Patent Agent, 62 St. Vincent Street, d, substantially as and for the purposes de- Glasgow.

xo scribed. JOHN ARMSTRONG, Junr.,

In Witness Whereot` We have hereunto set O'Zefrc, 62 St. Vincent Street, Glasgow., 

